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Reducing compressor vibrations by load torque compensation from acoustic point of view.

Number: 1187

Author(s) : THIELECKE A., HERBST J., HUEBEL J., FRIEDE W., GAENZLE D., MANDERLA M., BECKER S.

Summary

As heat pumps help meeting the CO2 reduction goals for residential heating, a fast and steady increase of residential heat pump sales is predicted. To enable the installation of heat pumps in densely populated areas, very low noise targets have to be met, especially in the European markets. One major noise source of heat pumps is the compressor. Many authors have identified load torque compensation (LTC) as promising method to reduce noise and vibrations of compressors. So far, this topic has been approached from a control-perspective with focus on developing suitable controller strategies. This paper, in contrast, analyses LTC from an acoustic point of view. It identifies which compressor excitations and hence vibrations can be reduced by LTC and which cannot. With this knowledge the noise reduction potential of LTC can be predicted. Therefore we performed vibration measurements on the compressor surface with and without LTC.
To investigate the effects of LTC inside the compressor and consequenially evaluate the potenial of LTC we performed multibody simulations. These simulations cover the path from the load torque source via the applied driving torque to the compressor vibrations. As input for the multibody simulation, the load torque to be compensated is calculated from thermodynamic and geometrical relationships. With our investigations we deliver the following findings: First, we derive how much certain vibration orders can be reduced by LTC. For the investigated twin rotary compressor, we were able to reduce even orders but not odd orders. Second, we estimate the reduction potential of LTC at different operational points. The reduction potential is increasing with higher pressure differences and decreasing with increasing rotational speed. Third we identify which vibration directions can be reduced by LTC. Based on these results, LTC can be combined more efficiently with other noise reduction measures, leading to quieter heat pumps.

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Pages: 6 p.

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  • Original title: Reducing compressor vibrations by load torque compensation from acoustic point of view.
  • Record ID : 30030275
  • Languages: English
  • Subject: Technology
  • Source: 2022 Purdue Conferences. 26th International Compressor Engineering Conference at Purdue.
  • Publication date: 2022/07/15

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